[FYI] Joe.Kirchoff
Original CL Desc
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UnrealHeaderTool: BuildSetting.V3 (currently disabled) which disallows adding module parent directory to include path list
#rnx
#rb bryan.sefcik
#preflight 634df3105f008d633fd571d2
[CL 22795918 by joe kirchoff in ue5-main branch]
This can be enabled by modifying `UnrealEngine\Engine\Saved\UnrealBuildTool\BuildConfiguration.xml` like so:
<?xml version="1.0" encoding="utf-8" ?>
<Configuration xmlns="https://www.unrealengine.com/BuildConfiguration">
<BuildConfiguration>
<bShaderCompilerWorkerTrace>true</bShaderCompilerWorkerTrace>
</BuildConfiguration>
</Configuration>
- Added a build configuration xml value, `bShaderCompilerWorkerTrace`.
- Turning this on will set USE_SHADER_COMPILER_WORKER_TRACE=1
- Move the parameter -nothreading to be set when we launch the process instead of internally as an extra cmd line arg.
- Unreal Insights uses a separate thread to send events so threading support is needed for the program. When we have USE_SHADER_COMPILER_WORKER_TRACE enabled we need to turn off `-nothreading`.
- When USE_SHADER_COMPILER_WORKER_TRACE is enabled we pass in `-trace=default` to get CPU event markers.
- The SCW program needs to turn on the following defines to be able to perform CPU and memory traces:
ENABLE_LOW_LEVEL_MEM_TRACKER=1
UE_MEMORY_TAGS_TRACE_ENABLED=1
UE_TRACE_ENABLED=1
- Instrument Shader Compiler Worker with TRACE_CPUPROFILER_EVENT_SCOPE. This are no-ops when this is turned off.
todo: Make the shader compiler worker inherit the trace args from the main process it was launched from.
#rb Yuriy.ODonnell
#jira none
#preflight 634ef80269246074db9637c2
[CL 22625183 by Jason Nadro in ue5-main branch]
Before:
1 Unity file
Total CPU Time: 162.90625 s
Total time in Parallel executor: 61.62 seconds
After:
6 Unity files
Total CPU Time: 169.15625 s
Total time in Parallel executor: 16.64 seconds
#jira
[FYI] nick.darnell, joe.kirchoff
#preflight 632889795f55ba280ec1ef84
[CL 22087017 by bryan sefcik in ue5-main branch]
This change does a few things:
* Improves compile times because the gen.cpp is inlined so less header parsing is required.
* Allows us to forward declare more types in the headers where we were not able to because the gen.cpp files did not have all the required headers included. The gen.cpp files required the header that generated it to include all the types because of the constructor and desructor in the gen.cpp need to know the full type.
#jira
#preflight 6323b43f8131e92d65aed1d9
[CL 22064061 by bryan sefcik in ue5-main branch]
- Deprecation warnings will show up in C# log, C++ log and in editor as a load warning
- Next changelist will use the system to make some replacements
#rb david.hibbits
#jira UE-130960
#preflight 631f3c4194758d0bf225bd95
[CL 21974033 by josh adams in ue5-main branch]
